diff --git a/src/corelib/io/qdebug_p.h b/src/corelib/io/qdebug_p.h
index 810fc3b4b65..9b048ae9ab9 100644
--- a/src/corelib/io/qdebug_p.h
+++ b/src/corelib/io/qdebug_p.h
@@ -23,6 +23,8 @@
 
 QT_BEGIN_NAMESPACE
 
+class QRect;
+
 namespace QtDebugUtils {
 
 Q_CORE_EXPORT QByteArray toPrintable(const char *data, qint64 len, qsizetype maxSize);
@@ -44,7 +46,15 @@ static inline void formatQSize(QDebug &debug, const Size &size)
 template <class Rect>
 static inline void formatQRect(QDebug &debug, const Rect &rect)
 {
-    debug << rect.x() << ',' << rect.y() << ' ' << rect.width() << 'x' << rect.height();
+    debug << rect.x() << ',' << rect.y() << ' ';
+    if constexpr (std::is_same_v<Rect, QRect>) {
+        // QRect may overflow. Calculate width and height in higher precision.
+        const qint64 w = qint64(rect.right()) - rect.left() + 1;
+        const qint64 h = qint64(rect.bottom()) - rect.top() + 1;
+        debug << w << 'x' << h;
+    } else {
+        debug << rect.width() << 'x' << rect.height();
+    }
 }
 
 template <class Margins>
diff --git a/tests/auto/corelib/tools/qrect/tst_qrect.cpp b/tests/auto/corelib/tools/qrect/tst_qrect.cpp
index c7c8b3a5601..ebf1d1b38bd 100644
--- a/tests/auto/corelib/tools/qrect/tst_qrect.cpp
+++ b/tests/auto/corelib/tools/qrect/tst_qrect.cpp
@@ -162,6 +162,8 @@ private slots:
     void smallRects() const;
     void toRect();
     void span();
+
+    void debug();
 };
 
 // Used to work around some floating point precision problems.
@@ -4499,5 +4501,33 @@ void tst_QRect::span()
     QCOMPARE(QRect::span(QPoint( 1, 10), QPoint(9,  0)), QRect(QPoint(1, 0), QPoint( 9, 10)));
 }
 
+void tst_QRect::debug()
+{
+    QString str;
+    QDebug debug(&str);
+
+    debug.nospace();
+
+    str.clear();
+    debug << QRect();
+    QCOMPARE(str, "QRect(0,0 0x0)");
+
+    str.clear();
+    debug << QRect(10, 20, 30, 40);
+    QCOMPARE(str, "QRect(10,20 30x40)");
+
+    str.clear();
+    debug << QRect(-10, -20, 30, 40);
+    QCOMPARE(str, "QRect(-10,-20 30x40)");
+
+    str.clear();
+    debug << QRect(-10, -20, -30, -40);
+    QCOMPARE(str, "QRect(-10,-20 -30x-40)");
+
+    str.clear();
+    debug << QRect(QPoint(INT_MIN, INT_MIN), QPoint(INT_MAX, INT_MAX));
+    QCOMPARE(str, "QRect(-2147483648,-2147483648 4294967296x4294967296)");
+}
+
 QTEST_MAIN(tst_QRect)
 #include "tst_qrect.moc"